From: eLinux.org

Parallel RC Scripts

Contents

Description

One way to reduce bootup time is to run RC scripts in parallel. RC
scripts are normally run in sequence in a desktop configuration of
Linux. By running the scripts in parallel, it is possible to take
advantage of the multi-processing capabilities of the OS (such as
overlapping execution with I/O, etc.)

How to implement or use

See the projects listed below for details on different methods of doing
this.

Expected Improvement

[Not determined yet.]

Resources

Projects

  • InitNG: a new replacement for SysV init. Boots your system much
    faster by running as much as possible asynchronously. See
    InitNG
  • IBM article on on using Makefile techniques to express dependencies
    between services and support parallel service start. See
    BootFaster
  • Richard Gooch project to rewrite boot script system from scratch.
    Eliminates lots of BSD and SYS V-isms, and introduces dependencies.
    See boot
    scripts
  • Serel project - for parallelizing service startup. Commands are
    inserted into RC scripts to cause needed services to start (based on
    XML database of dependencies). See
    fastboot

Specifications

  • LSB specification for comments in RC Scripts which allow
    parallization. See
    [1]

Patches

None.

Case Studies

[None yet.]

Case 1

[put information about an actual use of this technique here. A case
study should include:]

Hardware:: [hardware description here] Kernel Version:: [kernel version
here] Configuration:: [information about the configuration used here]
Time without change:: [put that here] Time with change:: [put that here]

[Add any additional notes as you see fit.]

Case 2

Case 3

Category: